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y in (-oo:+oo)
9/10-((4/5)*y) = 5/6 // - 5/6
9/10-((4/5)*y)-(5/6) = 0
(-4/5)*y+9/10-5/6 = 0
1/15-4/5*y = 0 // - 1/15
-4/5*y = -1/15 // : -4/5
y = -1/15/(-4/5)
y = 1/12
y = 1/12
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